“Bolting” and “Bolt” are terms used in this document to collectively describe fasteners, including screws, nuts, bolts, washers, and studs. The use of the terms “bolt” or “bolting” includes all of the fasteners listed above, unless otherwise specifically noted herein.
Fasteners are a wide ranging classification that includes screws, bolts, nuts, washers, stud bolts, rivets, powder actuated studs, staples, tacks, and pins. Bolting, which is composed of bolting materials, such as rods, bars, flats, and forgings, which are subsequently manufactured into bolting components, are a special subgroup of fasteners. Bolting materials and components have designated compositions and specific properties intended for applications in aggressive service where commercial generic fasteners may not be suitable or have insufficient fitness for purpose under certain conditions. These conditions include cryogenic or high temperature service, or excessive vibration, impact, or shock.
Bolting Specification
Bolting Classification
EN 1515-1
Material / strength class EN
Rm N/mm2
Reh N/mm2
Allowable stress N/mm2
Material / strength class ASTM
Allowable stress
Classification
ksi
N/mm2
1
4.6
400
240
133
A307 Gr.B
7
48
low
2
5.6
500
300
167
–
–
–
intermediate
4
8.8
800
640
267
A354 Gr.BC
25
172
high
05, 07
25CrMo4
600
440
200
–
–
–
high
06, 08
42CrMo4
860
730
287
B7
25
172
high
9
30CrNiMo8
1 040
940
347
L43
25
172
high
10
42CrMo5-6
860
700
287
–
–
–
high
11
40CrMoV4-6
850
700
283
B16
25
172
high
12
21CrMoV5-7
700
550
233
–
–
–
high
13
20CrMoVTiB4-10
820
660
273
–
–
–
high
14
X6NiCrTiMoVB 25-15-2
900
600
300
A453 Gr.660
21
147
intermediate
15
X7CrNiMoBNb16-16
650
500
217
–
–
–
high
16, 18
A4-50,A2-50
500
210
140
–
–
–
low
17, 19
A4-70, A2-70
700
450
233
–
–
–
high
20
X5CrNiMo17-12-2
500
200
133
B8M
19
130
low
21
X5CrNiMo17-12-2 AT+C
700
350
233
B8M Cl.2
20
138
intermediate
22
X5CrNi18-10
500
190
127
B8
19
130
low
23
X5CrNi18-10 AT+C
700
350
233
B8 CL.2
20
138
intermediate
Bolting Materials & Service Limits
PN Class up to
Temperature range oC
Type of material
Steel designation name or property class Steel designation number Material standard
bolts
nuts
bolts
nuts
PN 40 Cl. 300
-10 to 120
C-St
C-St
4.6 – EN 20898-1
5 – EN 20898-2
PN 40 1) Cl. 300
-10 to 300
C-St
C-St
5.6 – EN 20898-1
5 – EN 20898-2
PN 40 1) Cl. 300
-10 to 300
C-St
C-St
6.8 – EN 20898-1
6 – EN 20898-2
PN 40 1) Cl. 300
-10 to 300
C-St
C-St
8.8 – EN 20898-1
8 – EN 20898-2
All
-10 to 450
0,25C-1Cr-Mo
C-St elev. temp.
25CrMo4 1.7218 EN 10269
C35E 1.1181 EN 10269
All
-10 to 450
0,42C-1Cr-Mo
C-St elev. temp.
42CrMo4 1.7225 EN 10269
C45E 1.1191 EN 10269
All
-60 to 400
0,25C-1Cr-Mo
18Cr-9Ni
25CrMo4 1.7218 EN 10269
A2-50, A2-70 – EN ISO 3506-2
All
-100 to 450
0,42C-1Cr-Mo
0,42C-1Cr-Mo
42CrMo4 1.7225 EN 10269
42CrMo4 1.7225 EN 10269
All
-40 to 300
0,3C-2Cr-Ni-Mo
0,42C-1Cr-Mo
30CrNiMo8 1.6580 EN 10269
42CrMo4 1.7225 EN 10269
All
-10 to 500
0,42C-1,3Cr- 0,6Mo
0,42C-1Cr-Mo
42CrMo5-6 – EN 10269
42CrMo4 1.7225 EN 10269
All
-10 to 500
0,40C-1Cr- 0,6Mo-V
0,42C-1Cr-Mo
40CrMoV4-6 1.7711 EN 10269
42CrMo4 1.7225 EN 10269
All
-10 to 540
0,21C-1,3Cr- 0,7Mo-V
0,21C-1,3Cr- 0,7Mo-V
21CrMoV5-7 1.7709 EN 10269
21CrMoV5-7 1.7709 EN 10269
All
-10 to 600
0,2C-1Cr-1Mo- V-Ti-B
0,2C-1Cr-1Mo- V-Ti-B
20CrMoVTiB4-10 – EN 10269
20CrMoVTiB4-10 – EN 10269
All
-200 to 550
25Ni-15Cr-0,2Ti- Mo-V-B
25Ni-15Cr-0,2Ti- Mo-V-B
X6NiCrTiMoVB 25-15-2 1.4980 EN 10269
X6NiCrTiMoVB 25-15-2 1.4980 EN 10269
All
-10 to 550
16Cr-16Ni-Mo- B-Nb
16Cr-16Ni-Mo- B-Nb
X7CrNiMoBNb16-16 1.4986 EN 10269
X7CrNiMoBNb16-16 1.4986 EN 10269
PN 40 Cl. 300
-200 to 400
18Cr-9Ni-Mo
18Cr-9Ni-Mo
A4-50 – EN ISO 3506-1
A4-50 – EN ISO 3506-2
PN 100 Cl. 600
-200 to 400
18Cr-9Ni-Mo
18Cr-9Ni-Mo
A4-70 – EN ISO 3506-1
A4-70 – EN ISO 3506-2
PN 40 Cl. 300
-200 to 400
18Cr-9Ni
18Cr-9Ni
A2-50 – EN ISO 3506-1
A2-50 – EN ISO 3506-2
PN 100 Cl. 600
-200 to 400
18Cr-9Ni
18Cr-9Ni
A2-70 – EN ISO 3506-1
A2-70 – EN ISO 3506-2
PN 40 Cl. 300
-200 to 550
17Cr-12Ni-2Mo
17Cr-12Ni-2Mo
X5CrNiMo17-12-2 1.4401 EN 10269
X5CrNiMo17-12-2 1.4401 EN 10269
PN 100 Cl. 600
-200 to 200 2)
17Cr-12Ni-2Mo AT+C
17Cr-12Ni-2Mo
X5CrNiMo17-12-2 AT+C 1.4401 EN 10269
X5CrNiMo17-12-2 1.4401 EN 10269
PN 40 Cl. 300
-200 to 550
18Cr-10Ni
18Cr-10Ni
X5CrNi18-10 1.4301 EN 10269
X5CrNi18-10 1.4301 EN 10269
PN 100 Cl. 600
-200 to 200 2)
18Cr-10Ni AT+C
18Cr-10Ni
X5CrNi18-10 AT+C 1.4301 EN 10269
X5CrNi18-10 1.4301 EN 10269
1) Up to PN 63 for temperature up to 120 oC. 2) Allowable stresses for elevated temperatures may be taken from the material in AT condition, as no stresses exist for the cold worked condition
Bolting Material Combination
PN Class up to
Suitable temperature range °C
Type of bolting and description of material groups
Steel designation name or property class Steel designation number Material standard
Bolts, screws, studs
Nuts
Bolts, screws, studs
Nuts
PN 40a Cl. 300
– 10 to 300
C-St
C-St
5.6g – EN ISO 898-1
5e – EN 20898-2
PN 40a Cl. 300
– 10 to 300
C-St
C-St
8.8g – EN ISO 898-1
8 – EN 20898-2
all
– 10 to 400
0,25C-1Cr-Mo
C-St elev. temp.
25CrMo4 1.7218 EN 10269
C35E 1.1181 EN 10269
all
– 10 to 350
0,42C-1Cr-Mo
C-St elev. temp.
42CrMo4 1.7225 EN 10269
C45E 1.1191 EN 10269
all
– 60 to 400
0,25C-1Cr-Mo
18Cr-9Ni
25CrMo4 1.7218 EN 10269
A2-50, A2-70 g – EN ISO 3506-2
all
– 60 to 500
0,25C-1Cr-Mo
0,25C-1Cr-Mo
25CrMo4h 1.7218 EN 10269
25CrMo4 1.7218 EN 10269
all
– 100 to 500
0,42C-1Cr-Mo
0,42C-1Cr-Mo
42CrMo4h 1.7225 EN 10269
42CrMo4 1.7225 EN 10269
all
– 10 to 500
0,42C-1,3Cr- 0,6Mo
0,42C-1Cr-Mo
42CrMo5-6h 1.7233 EN 10269
42CrMo4 1.7225 EN 10269
all
– 10 to 500
0,40C-1Cr- 0,6Mo-V
0,42C-1Cr-Mo
40CrMoV4-6h 1.7711 EN 10269
42CrMo4 1.7225 EN 10269
allc
– 10 to 500
0,21C-1,3Cr- 0,7Mo-V
0,21C-1,3Cr- 0,7Mo-V
21CrMoV5-7h 1.7709 EN 10269
21CrMoV5-7 1.7709 EN 10269
all
– 10 to 500
0,2C-1Cr-1Mo- V-Ti-B
0,2C-1Cr-1Mo- V-Ti-B
20CrMoVTiB4-10h 1.7729 EN 10269
20CrMoVTiB4-10 1.7729 EN 10269
allc
– 196j to 650
25Ni-15Cr-0,2Ti- Mo-V-B
25Ni-15Cr- 0,2Ti-Mo-V-B
X6NiCrTiMoVBh 25-15-2 1.4980 EN 10269
X6NiCrTiMoVB 25-15-2 1.4980 EN 10269
allc
– 10 to 500
12Cr-1Mo-V
12Cr-1Mo-V
X22CrMoV12-1h 1.4923 EN 10269
X22CrMoV12-1 1.4923 EN 10269
all
– 10 to 650
16Cr-16Ni-Mo- B-Nb
16Cr-16Ni-Mo- B-Nb
X7CrNiMoBNb16-16h 1.4986 EN 10269
X7CrNiMoBNb16-16 1.4986 EN 10269
PN 40d Cl. 300
– 196 to 400
18Cr-9Ni
18Cr-9Ni
A2-50g – EN ISO 3506-1
A2-50g – EN ISO 3506-2
PN 100 Cl. 600
– 196 to 400
18Cr-9Ni
18Cr-9Ni
A2-70g – EN ISO 3506-1
A2-70g – EN ISO 3506-2
PN 40d Cl. 300
– 60f to 400
18Cr-9Ni-Mo
18Cr-9Ni-Mo
A4-50g – EN ISO 3506-1
A4-50g – EN ISO 3506-2
PN 100 Cl. 600
– 60f to 400
18Cr-9Ni-Mo
18Cr-9Ni-Mo
A4-70g – EN ISO 3506-1
A4-70g – EN ISO 3506-2
PN 40d Cl. 300
– 196 to 550
17Cr-12Ni-2Mo
17Cr-12Ni-2Mo
X5CrNiMo17-12-2 AT 1.4401 EN 10269
X5CrNiMo17-12-2 1.4401 EN 10269
PN 100 Cl. 600
– 196 to 200b
17Cr-12Ni-2Mo AT+C
17Cr-12Ni-2Mo
X5CrNiMo17-12-2 AT+C 1.4401 EN 10269
X5CrNiMo17-12-2 1.4401 EN 10269
PN 40d Cl. 300
– 196 to 550
18Cr-10Ni
18Cr-10Ni
X5CrNi18-10 1.4301 EN 10269
X5CrNi18-10 1.4301 EN 10269
PN 100 Cl. 600
– 196 to 200b
18Cr-10Ni AT+C
18Cr-10Ni
X5CrNi18-10 AT+C 1.4301 EN 10269
X5CrNi18-10 1.4301 EN 10269
a Up to PN 63 for temperature up to 120 °C. b Allowable stresses for elevated temperatures may be taken from the material in AT condition, as no stresses exist for the cold worked condition. c Commonly used for PN 160 up to PN 400. d Is limited to be used for max. PN 40/Cl. 300 (low strength bolting). e The use of free-cutting steel is not permitted. f – 196 °C for studs. g Starting material shall comply with EN 10269 (see 6.1). h May be used in the creep range. For maximum suitable temperature see EN 10269. j When intended to be used down to – 273 °C, for additional requirements see Table 5, footnote a.
Equivalent Bolting Material
Product
Material designation name or property class or grade Material standard for materials in accordance with
Remarks 1)
EN
BS
NF
DIN
ASTM
Bolt
4.6 EN 20898-1
4.6 BS EN 20898: Part 1:1992
4.6 NF EN 20898-1
4.6 DIN ISO 898: Teil 1
Gr. B ASTM A307
1)
Nut
5 EN 20898-2
5 BS EN 20898: Part 2:1994
5 NF EN 20898-2
5 DIN EN 20898: Teil 2
1/2 ASTM A194
2)
Bolt
5.6 EN 20898-1
5.6 BS EN 20898: Part 1:1992
5.6 NF EN 20898-1
5.6 DIN ISO 898: Teil 1
– –
2)
Nut
6 EN 20898-2
6 BS EN 20898: Part 2:1994
6 NF EN 20898-2
6 DIN EN 20898: Teil 2
– –
2)
Bolt
6.8 EN 20898-1
6.8 BS EN 20898: Part 1:1992
6.8 NF EN 20898-1
6.8 DIN ISO 898: Teil 1
– –
2)
Nut
8 EN 20898-2
8 BS EN 20898: Part 2:1994
8 .NF EN 20898-2
8 DIN EN 20898: Teil 2
– –
2)
Bolt
8.8 EN 20898-1
8.8 BS EN 20898: Part 1:1992
8.8 NF EN 20898-1
8.8 DIN ISO 898: Teil 1
– –
2)
Nut
C35E EN 10269
– –
– –
Ck35 DIN 17240
– –
–
Nut
C45E EN 10269
162 BS 1506
AF65C45 NF E29-043
Ck45 –
2H ASTM A194
–
Bolt
25CrMo4 EN 10269
– –
25CD4 NF E29-043
24CrMo5 DIN 17240
– –
ET
Bolt
25CrMo4 EN 10269
– –
25CD4 NF E29-043
26CrMo5 DIN 17280
– –
LT
Bolt
42CrMo4 EN 10269
630 BS 1506
42CD4 NF E29-043
– –
B7 ASTM A193
ET
Bolt
42CrMo4 EN 10269
630 BS 1506
42CD4 NF E29-043
– –
L7 ASTM A320
LT
Nut
42CrMo4 EN 10269
253 BS 1506
42CD4 NF E29-043
– –
7 ASTM A194
LT
Bolt
42CrMo5-6 EN 10269
– –
– –
– –
– –
–
Bolt
30CrNiMo8 EN 10269
– –
40NCD7-03 NF E29-043
– –
L43 ASTM A320
–
Bolt
40CrMoV4-6 EN 10269
670-860 BS 1506
42CDV4 NF E29-043
40CrMoV4 7 DIN 17240
B16 ASTM A193
–
Bolt and Nut
21CrMoV5-7 EN 10269
–
20CDV5-07 NF E29-043
21CrMoV5 7 DIN 17240
–
–
Bolt and Nut
20CrMoVTiB 4-10 EN 10269
681-820 BS 1506
–
–
–
–
Bolt and Nut
X6NiCrTiMoVB 25-15-2 EN 10269
286 BS 1506
Z6NCTDV25-15 NF E29-043
X5NiCrTi26 15 VdTueV 435/3
Gr.660 ASTM A 453
–
Bolt and Nut
X7CrNiMoBNb 16-16 EN 10269
– –
– –
X8CrNiMoBNb 16 16 DIN 17240
– –
–
Bolt and Nut
A4-50 EN ISO 3506-2
A4-50 BS EN ISO 3506 : Part 2: 1998
A4-50 NF EN ISO 3506-2
A4-50 DIN EN ISO 3506-2
– –
2)
Bolt and Nut
A4-70 EN ISO 3506-2
A4-70 BS EN ISO 3506 : Part 2: 1998
A4-70 NF EN ISO 3506-2
A4-70 DIN EN ISO 3506-2
– –
2)
Bolt and Nut
A2-50 EN ISO 3506-2
A2-50 BS EN ISO 3506 : Part 2: 1998
A2-50 NF EN ISO 3506-2
A2-50 DIN EN ISO 3506-2
– –
2)
Bolt and Nut
A2-70 EN ISO 3506-2
A2-70 BS EN ISO 3506 : Part 2: 1998
A2-70 NF EN ISO 3506-2
A2-70 DIN EN ISO 3506-2
– –
2)
Bolt
X5CrNiMo 17-12-2 EN 10269
B8M 316S31 BS 4882
Z7CND17-11-02 NF E29-043
X6CrNiMoTi 17 12 2 DIN 17440
B8M CL.1 ASTM A193 ASTM A320
–
Bolt
X5CrNiMo 17-12-2 AT+C EN 10269
B8MX 316S31 BS 4882
Z7CND17-11-02 Ecroui NF E29-043
– –
B8M CL.2 ASTM A193 ASTM A320
–
Nut
X5CrNiMo 17-12-2 EN 10269
8M 316S31 BS 4882
Z7CND17-11-02 NF E29-043
X6CrNiMoTi 17 12 2 DIN 17440
8M ASTM A194
–
Bolt
X5CrNi 18-10 EN 10269
B8 304S31 BS 4882
Z6CN18-09 NF E29-043
X5CrNi18 10 DIN 17440
B8 CL.1 ASTM A193 ASTM A320
–
Bolt
X5CrNi 18-10 AT+C EN 10269
B8X 304S31 BS 4882
Z6CN18-09 Ecroui NF E29-043
– –
B8 CL.2 ASTM A193 ASTM A320
–
Nut
X5CrNi 18-10 EN 10269
8 304S31 BS 4882
Z6CN18-09 NF E29-043
X5CrNi18 10 DIN 17440
8 ASTM A194
–
1) ET = service at elevated temperatures, LT = service at low temperatures. 2) BS 3692, BS 4190, NF E29-043, NF E25-100 and NF E25-400 may also be used.
Bolting Types
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